Som 9s – STIEBEL ELTRON SOM 9s User Manual
Page 35
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SOM 9s
Adjustment channels
Channel
Sub channel 1 Sub channel 2 Factory
setting
Change to Description
Page
ARR
1
14
System
78
LOAD1 >
Loading 1
DT1O
12 °R
Switch-on temperature difference 1
78
DT1F
8 °R
Switch-off temperature difference 1
78
DT1S
20 °R
Set temperature difference 1
78
RIS1
4 °R
Rise 1
78
S1MAX
140 °F
Tank maximum limitation 1
78
SMXS1
2
Sensor tank max 1
79
LOAD2 >
Loading 2
DT2O
12 °R
Switch-on temperature difference 2
78
DT2F
8 °R
Switch-off temperature difference 2
78
DT2S
20 °R
Set temperature difference 2
78
RIS2
4 °R
Rise 2
78
The controller compares the temperature at sensor S1 to
the temperatures at sensors S2 and S3. If the measured
temperature differences are higher than the adjusted switch-
on temperature differences, the pump (R1) will be activated
and the corresponding tank zone will be loaded up to the
adjusted maximum temperature via the valve (R3). The prio-
rity logic effects prior loading of the upper zone of the tank.
With another temperature differential function (S3-heat
source/S4-heat sink) heating circuit return preheating (hea-
ting circuit backup) is possible via another valve (R2).
System 14
Solar system with vertical tank loading and return preheating
R3
R2
R1
S4
S3
S2
S1
Temp. Sensor
Pt1000
L
R3
R2
R1
GND
S1
S2
S3
S4
S5
VBus
PWM
1
PWM
2
N
R4
V40
L'
VFS
RPS
out
in
Sensor/Ter-
minal
Designation
Description
S1
TCOL
Temperature collector
S2
TSTB
Temperature tank bottom
S3
TSTT/TSTR Temperature tank top/
Temp. tank return preheating
S4
TRET
Temperature return
S5
Optional sensor for measurement
purposes or options
VFS
RPS
V40
Relay
Description
R1
Solar pump
R2
Return preheating
R3
3-port valve tank top/bottom
R4
optional:
Thermal disinfection
Parallel relay
Heat dump
Note: 3-port valve normally open - tank bottom